Lead hydrogen arsenate

Lead glance Lead glass Lead heat stabilizers Lead hydrogen arsenate Lead hydroxide... 

Hydrocarbons C26 5s, aromatic-rich Lead hydrogen arsenate 2-Methylaziridine... 

The property of adherence of dusts to the plants determines their effectiveness. It varies considerably with composition, lead hydrogen arsenate adhering to a greater extent than magnesium arsenate and this more than calcium arsenate. The presence of slaked lime reduces the adherence.2 The air condition at the time of dusting also has an effect, the adhesion decreasing with increased wind velocity.3... 

If a soap is added to a lead hydrogen arsenate-hydrated ferric oxide mixture considerable damage and leaf drop is caused, especially if the soap contains a strong base, as in the case of commercial potash fish-oil soap or potassium oleate. Laboratory tests show that more soluble arsenic is formed than with a soap of a weak base such as triethanolamine oleate.7 The addition of cryolite to an arsenate inhibits the formation of soluble arsenic 8 fluosilicates cause decomposition. These fluorine... 

For the larvae of the Colorado potato beetle the established lethal dose of lead hydrogen arsenate is 0-30 mg. per gram of body weight 6 that of Paris green is less than one-third that amount. The quantity of arsenic remaining in potato fields after treatment is so small as to offer no danger of intoxication.7 Calcium arsenate is most efficient and economical for the control of the potato flea beetle.8 A study of the use of similar dusts for the control of June beetles on oak leaves showed that the death of the beetles, which occurred within 72 hours, was due to their eating the poison and not to contact with the dust. ... 

Lead hydrogen arsenate, an inorganic insecticide used against the potato beetle, is produced by the following reaction ... 

Iron and aluminum precipitate out when treated with ammonia and are removed by filtration. Other metals, such as copper, zinc, lead and arsenic are precipitated and removed as sulfides upon passing hydrogen sufide through the solution. Colloidal particles of metaUic sulfides and sulfur are removed by treatment with iron(ll) sulfide. The purified solution of manganese(ll) sulfate is then electrolyzed in an electrolytic cell using lead anode and HasteUoy or Type 316 stainless steel cathode, both of which are resistant to acid. Manganese is deposited on the cathode as a thin film. 

OxideofOoba.lt, the ores of which, after grinding and roasting, to drive off as much as possible the excess of arsenic and sulphur, are dissolved in hydrochloric add, sometimes with the addition of a small quantity of nitric acid. The copper, lead, silver, arsenic, antimony, el cetera, are precipitated by sulphide of hydrogen, and to the filtered solution carbonate of lime is added in (he form of chalk, by which all the iron, alumina, and a trace ot cobalt are thrown down, the nickel and cobalt remaining in solution. To this solution which must ho hot and neutral, a solutien of bleaching powder is added in sufficient quantity to precipitate the cobalt, and the menstruum is then well boiled to remove the chlorine as fast as possible. The oxide of nickel is afterwards precipitated from the filtrate by the addition of hydrate of lime, and ebullition. 

The first commercially successfull synthetic nacreous pigments were hexagonal platelet crystals of lead salts Thiosulfate, hydrogen phosphate, hydrogen arsenate and most important nowadays, basic carbonate. Basic lead carbonate [1319-46-6] Pb(OH2) 2PbC03, Mr 775.7, is precipitated from aqueous lead acetate or lead propionate solutions with carbon dioxide ... 

The anhydrous salt yields yellowish-white crystals of density2 7-3 at 15° C. and melting point 3 1042° C. The specific heat is 4 0-0728 and the molar heat 05-4. The index of refraction is 2 2-14. It is insoluble in water, aqueous ammonia and in solutions of ammonium salts,5 and only slightly soluble in aqueous alkali or brine.6 It is decomposed when heated with hydrogen chloride,7 forming lead and arsenic chlorides, and in hot nitric acid it dissolves to form arsenic acid and lead nitrate, the latter being precipitated if the acid is sufficiently concentrated.8... 

Lead(ll) hydrogen arsenate PbHAsO 7784-40-9 347.1 wh monoci cry 280 dec 6.943 IH30 sHN03, alk... 

The sublimed germaniun(II) sulfide, recovered from germanite, is usually not pure but contains lead and arsenic sulfides. These are eliminated during the process of preparing the (Il)iodide and need not be removed previously. After oxidation of the residues left in the reaction flask, however, it is convenient to precipitate these elements by hydrogen sulfide from a dilute acid solution (0.2 N) before recovery of the germanium as the (IV)sulfide that is precipitated from a 6 iV acid solution. ... 

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